CN118112328B - Active detection method for shunt mounting point impedance - Google Patents
Active detection method for shunt mounting point impedanceInfo
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- CN118112328B CN118112328B CN202410534424.XA CN202410534424A CN118112328B CN 118112328 B CN118112328 B CN 118112328B CN 202410534424 A CN202410534424 A CN 202410534424A CN 118112328 B CN118112328 B CN 118112328B
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- 238000001514 detection method Methods 0.000 title claims abstract description 80
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- 238000005070 sampling Methods 0.000 claims abstract description 11
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Abstract
The invention discloses an active detection method for the impedance of a mounting point of a shunt device, which relates to the technical field of shunt measurement resistance and comprises a shunt device, a direct current source, a load and a detection device, wherein the structure of the shunt device comprises a shunt main body, a mounting terminal and a current acquisition terminal, and a pair of mounting terminals on the outer side of the shunt device are sequentially connected with the direct current source and the load in series to form a main loop; according to the invention, the impedance detection circuit of the installation point of the shunt device is arranged, the diagnosis acquisition circuit and the current acquisition circuit are arranged on the main loop where the shunt device is arranged, so that the functions of completing the self-checking stage on the electronic and electric equipment of a new energy battery pack, a fuel cell stack and a quick-charging pile, rapidly and accurately detecting the contact impedance of the shunt device are realized, and the functions of diagnosing loosening, disconnection and large contact impedance of a sampling wire harness are realized by utilizing an ohm law algorithm on the impedance method of the installation point of the shunt device.
Description
Technical Field
The invention relates to the technical field of shunt resistance measurement, in particular to an active detection method for the impedance of a shunt mounting point.
Background
The current divider is an electrical component instrument for measuring direct current, and is manufactured according to the principle that voltage is generated at two ends of a resistor when the direct current passes through the resistor, the direct current is calculated based on ohm's law i=v/R, and the current flowing through the current divider is usually tens of amperes to thousands of amperes.
The shunt is made by 2 copper joints and middle resistance alloy combination generally, adopts four-terminal method to measure the electric current size that flows through the shunt, installs and need use the screw fixation in the mounting hole position in electrical equipment, and the mounting point needs higher plane laminating degree with the surface of mounting hole to guarantee that contact resistance is less simultaneously needs to guarantee the fastening dynamics of screw.
For example, because the service life of the electrical equipment is longer and the working environment has uncertainty such as that the contact impedance is large due to environmental pollution, the screw fastening force is small due to long-time vibration, the contact impedance is large, the contact impedance of the mounting point of the shunt is large, and the problems that the service life of the shunt is influenced, the sampling current precision is influenced due to contact heating in high-current operation are easily caused.
The prior art has the following defects: the conventional method for preventing the contact impedance of the mounting point of the shunt comprises two methods, wherein the former method only can ensure the consistency of flatness through technological requirements in the mounting process, and the former method can only be manually or technically processed when leaving a factory and cannot be detected in the later use process; the temperature acquisition point is added on the shunt to monitor the temperature of the shunt body or the mounting point, but when the temperature is acquired, the temperature sensor usually needs second-level time to convert the detected temperature into the resistance, and the abnormal condition of the contact cannot be detected quickly, and the equipment can be detected after working or the working current is larger than a certain condition; therefore, the existing method for preventing the contact impedance of the mounting point of the shunt cannot detect accurate contact impedance, cannot judge whether the working condition of equipment is affected, and cannot diagnose abnormal conditions such as loosening, disconnection, large contact impedance and the like of the sampling wire harness.
The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an active detection method for the impedance of a mounting point of a shunt device, and aims to solve the problems in the background technology through a circuit and a method for detecting the impedance of the mounting point of the shunt device.
In order to achieve the above object, the present invention provides the following technical solutions: the active detection circuit comprises a shunt device, a direct current source and a load, wherein the structure of the shunt device comprises a shunt main body, a mounting terminal and a current acquisition terminal, a pair of mounting terminals on the outer side of the shunt device are sequentially connected with the direct current source and the load in series to form a main loop, and a detection device is arranged on four terminals of the shunt device;
The detection device comprises a diagnosis acquisition circuit connected in series with a pair of mounting terminals positioned on the outer side of the shunt device, the diagnosis acquisition circuit is connected with the main loop in parallel, the input of the diagnosis acquisition circuit is connected with an excitation source circuit, and the excitation source circuit comprises an excitation source and a constant current source;
The detection device is in turn connected in series with a current collection circuit comprising a pair of current collection terminals located inside the shunt device.
Preferably, the direct current source comprises a positive electrode and a negative electrode, wherein the positive electrode is one end of current output, and the negative electrode is an input end of current.
Preferably, the excitation source circuit includes a first current output and a second current output, and both the excitation and the constant current output modes of the excitation source circuit can output the first current and the second current.
Preferably, the diagnosis acquisition circuit comprises a first operational amplifier and a first analog-to-digital converter, and a pin 1 of the first operational amplifier is connected with the first analog-to-digital converter IN series, and the first operational amplifier comprises pins 1,2 and 3, V+, V-and 1IN+ and 1 IN-pins;
the No. 1 pin is used for outputting an analog signal obtained by amplifying an input signal by an operational amplifier, and the No. 2 pin and the No. 3 pin are pins connected with the input signal;
the V+ pin and the V-pin respectively represent the positive power supply input and the negative power supply input of the operational amplifier;
1in+ and 1 IN-are the non-inverting input and the inverting input, respectively, of the operational amplifier.
Preferably, the current acquisition circuit comprises a second operational amplifier and a second analog-to-digital converter, the pin 1 of the second operational amplifier is connected with the second analog-to-digital converter in series, and the second operational amplifier is identical to the first operational amplifier.
Preferably, the shunt device is internally provided with an ohm law algorithm and a branch shunt proportion limiting function, wherein the self-checking stage comprises the following steps:
automatic triggering detection: the equipment starts a contact impedance detection program of the shunt device in a self-checking stage, starts a self-checking function and monitors the working state of the shunt;
an ohm law detection algorithm is performed: an algorithm built in the detection device evaluates the impedance condition of the diverter contact by sending a specific test signal and according to a received feedback signal so as to detect whether the connection is good, whether the contact resistance accords with the expected problem and whether the abnormality exists;
Analysis results: the detection device analyzes and judges the result according to the detected impedance condition of the shunt contact, and when the impedance abnormality is detected, the detection device automatically records fault information or sends warning information to a user;
automatic adjustment and feedback: based on the detection, the detection device may take steps to automatically adjust, such as providing a suggested solution or automatically calibrating the diverter to ensure proper operation.
Preferably, the shunt device mounting point impedance detection circuit is used for electronic and electric equipment using a shunt, and the electronic and electric equipment comprises a new battery pack, a fuel cell stack and a quick-charging pile for an electric vehicle.
Preferably, the excitation source circuit is designed as an on-board structure directly printed on a circuit board (PCB), or is designed as a separate external component, and is used for providing voltage or current signals, and can also be used for providing stable constant current output;
The shunt device mounting point impedance detection circuit can be used as an independent module and can be integrated with a host machine into a whole;
the shunt device mounting point impedance detection circuit can be used as a minimum IP unit integration and IC internal use;
The shunt device mounting point impedance detection circuit can be used as a module in test equipment with shunt off-line equipment;
and the active detection shunt contact impedance circuit can be used for a shunt body offline test module.
Preferably, the active detection method for the impedance of the mounting point of the shunt comprises the following steps:
S1, preparing a load connection main loop: preparing an electronic and electrical device using a shunt device, comprising a new energy battery pack, a fuel cell stack and a quick-fill pile, preparing a shunt device with four terminals and a direct current source, wherein the direct current source supplies power to a load and causes current to flow in a main loop, and the shunt device measures main current by shunting part of the current;
S2, setting a diagnosis acquisition circuit and a current acquisition circuit: on one hand, a pair of mounting terminals outside the shunt device are connected with a diagnosis acquisition circuit in series, excitation source circuits are arranged at two ends of the diagnosis acquisition circuit, the excitation source circuits comprise an excitation source and a constant current source, the excitation source circuits can provide voltage or current signals for testing or measuring, the excitation source circuits can also provide constant current for accurate impedance measurement, and on the other hand, a pair of current acquisition terminals inside the shunt device are connected with a current acquisition circuit in series;
s3, measuring impedance: first, the excitation source circuit provides a constant current output known as stable current, which is calibrated as And to the shunt device;
then the voltage drop at the two ends of the shunt device is measured by using a diagnosis acquisition circuit and is calibrated as As a reference measurement value, and calculate the resistance value of the shunt device plus the resistance value of the mounting contact point through ohm's law, and mark asThe size of the resistance of the shunt device plus the resistance of the mounting contact is；
Secondly, the known resistance value is marked asThe parameter shunt device calculates the resistance value of the mounting contact through ohm law of the series circuit and marks asThe resistance of the mounting contact is as follows；
Finally, the known resistance parameter of the shunt device is judgedAnd mounting contact resistanceThe sum ofValue of shunt device resistance plus mounting contact resistanceComparing to judge whether the mounting contact is abnormal;
s4, monitoring, diagnosing and analyzing: by ohm's law Calculating to obtain the impedance value of each measuring point, wherein,Is the voltage drop measured by the current acquisition circuit,Is the known current provided by the constant current source;
first, the output first current outputted by the excitation source circuit is calibrated as When the voltage is detected, the diagnosis acquisition circuit diagnoses and acquires the first voltage, and marks the first voltage asCalculating the resistance value of the shunt device and the resistance value of the mounting contact through ohm's law；
When diagnosing the first voltageAt volts, the output second current output by the excitation source circuit is calibrated asWhen the voltage is detected, the diagnosis acquisition circuit diagnoses and acquires the second voltage, and marks the second voltage asCalculating the resistance value of the shunt device and the resistance value of the mounting contact through ohm's law；
When diagnosing the second voltageJudging abnormal mounting points or diagnosing abnormal injection ports when the voltage is high;
When diagnosing the first voltage And a second voltageAll are in normal voltage state, and the resistance value and calibration of the shunt device are as followsCalculating the resistance value of the mounting contact as a known parameter, and calibrating asThenTo determine whether the mounting contact is abnormal;
The output first current, which is supplied as a constant current output by the excitation source circuit, is calibrated as The third voltage collected by the current collection circuit is calibrated asCalculating the resistance value of the shunt device and calibrating the resistance value asI.e. the size of the resistance of the shunt device isThe resistance value of the shunt device calculated by ohm's lawResistance value of the current divider is equal to that of the known current dividerComparing to determine whether the collection wire harness is abnormal or whether the current divider body resistance is abnormal, namely when the third voltageJudging that the acquisition linearity is abnormal when the voltage is high;
comparing impedance values of different measuring points, analyzing impedance of the mounting position of the shunt device, and checking whether abnormal high resistance or low resistance exists due to poor contact;
s5, optimizing and adjusting: when an impedance anomaly is detected, the mounting mode of the shunt device needs to be adjusted, the quality of the contact point is improved, components are replaced, and the circuit is calibrated, retested and the mounting environment is optimized.
Preferably, the contact impedance of the mounting point of the conventional shunt comprises the conventional shunt, the conventional shunt is composed of electrode materials, resistance alloy and bonding materials, the surface of the shunt is respectively provided with a mounting hole and a sampling point, when the conventional shunt is mounted in electrical equipment, the conventional shunt is required to be fixed at the position of the mounting hole by using screws, and then is connected with a connecting circuit of the electrical equipment, when the contact impedance of the mounting hole and the sampling point is reached, the four-terminal method is adopted to measure the current flowing through the conventional shunt, and then the current input and the voltage output of the conventional shunt are measured.
In the technical scheme, the invention has the technical effects and advantages that:
According to the invention, the diagnosis acquisition circuit and the current acquisition circuit are arranged on the main loop where the shunt device is arranged by arranging the impedance detection circuit at the installation point of the shunt device, so that the self-checking stage function is realized on the electronic and electric equipment of the new energy battery pack, the fuel cell stack and the quick-charging pile, and the contact impedance of the shunt can be rapidly and accurately detected;
According to the invention, the functions of diagnosing that the sampling wire harness is loose, disconnected and high in contact impedance are realized by utilizing an ohm law algorithm on the impedance method of the installation point of the shunt device, the function of diagnosing that the impedance value of the shunt body is abnormal can be diagnosed, the accuracy and the efficiency of fault diagnosis of the wire harness are improved, and the stable and reliable operation of a wire harness system is ensured.
Drawings
Fig. 1 is a schematic diagram of a structure of a shunt device mounting point impedance detection circuit of the present invention.
Fig. 2 is a flow chart of a method for detecting the impedance of a mounting point of a shunt device according to the present invention.
FIG. 3 is a schematic diagram of a four-terminal measuring circuit of the current divider of the present invention.
The reference numerals are: 1. a shunt device; 101. a diverter body; 102. mounting terminals; 103. a current collection terminal; 2. a direct current source; 201. a positive electrode; 202. a negative electrode; 3. a load; 4. a detection device; 5. a diagnostic acquisition circuit; 501. a first operational amplifier; 502. a first analog-to-digital converter; 6. an excitation source circuit; 601. outputting a first current; 602. outputting a second current; 7. a current acquisition circuit; 701. a second operational amplifier; 702. a second analog-to-digital converter; 8. a conventional shunt; 801. an electrode material; 802. a resistance alloy; 803. a bonding material; 804. a mounting hole; 805. sampling points; 806. an electrical equipment connection circuit; 807. a screw; 808. a current input; 809. and outputting voltage.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Example 1
The invention provides an active detection circuit for the impedance of a mounting point of a shunt, which is shown in fig. 1, and comprises a shunt device 1, a direct current source 2 and a load 3, wherein the structure of the shunt device 1 comprises a shunt main body 101, a mounting terminal 102 and a current acquisition terminal 103, a pair of mounting terminals 102 on the outer side of the shunt device 1 are sequentially connected in series with the direct current source 2 and the load 3 to form a main loop, and a detection device 4 is arranged on the four-terminal of the shunt device 1;
The detection device 4 comprises a pair of mounting terminals 102 positioned at the outer side of the shunt device 1, wherein the pair of mounting terminals 102 are connected with the diagnosis acquisition circuit 5 in series, the diagnosis acquisition circuit 5 is connected with the main loop in parallel, the input of the diagnosis acquisition circuit 5 is connected with the excitation source circuit 6, and a constant-current output mode exists in the excitation source circuit 6;
the detecting means 4 in turn comprise a pair of current collecting terminals 103 inside the shunt device 1 connected in series to the current collecting circuit 7.
Specifically, the dc source 2 includes a positive electrode 201 and a negative electrode 202, the positive electrode 201 is one end of current output, the negative electrode 202 is an input end of current, the current direction of the main circuit is that the positive electrode 201 flows to the negative electrode 202, and the current of the dc source 2 flows in only one direction.
Specifically, the excitation source circuit 6 further includes a first current 601 and a second current 602, and both the excitation mode and the constant current mode of the excitation source circuit 6 can output the first current 601 and the second current 602, so as to detect the impedance of the shunt contact and diagnose the resistance of the mounting contact.
Specifically, the diagnostic collecting circuit 5 includes a first operational amplifier 501 and a first analog-to-digital converter 502, and pin 1 of the first operational amplifier 501 is connected IN series with the first analog-to-digital converter 502, and is used for converting an analog signal output by the operational amplifier after amplifying an input signal into a digital signal, the first operational amplifier 501 includes pins 1, 2,3, v+, V-and 1in+ and 1IN-, wherein pin 1 is a pin for outputting the analog signal obtained by amplifying the input signal by the operational amplifier, and pin 2 and 3 are pins connected with the input signal; the V+ pin and the V-pin respectively represent a positive power supply input and a negative power supply input of the operational amplifier and are used for providing necessary power supply voltage for the operation of the operational amplifier; 1IN + and 1 IN-are the non-inverting input and inverting input, respectively, of the operational amplifier, the non-inverting input 1IN + being that when the input signal is applied to this pin, the phase of the output signal will be the same as the input signal, i.e. the signal will not be inverted, and increasing the voltage on the non-inverting input will increase the output voltage, whereas the inverting input 1 IN-is that when the input signal is applied to this pin, the phase of the output signal will be opposite to the input signal, i.e. the signal will be inverted, and increasing the voltage on the inverting input will decrease the output voltage.
Specifically, the current collecting circuit 7 includes a second operational amplifier 701 and a second analog-to-digital converter 702, and pin 1 of the second operational amplifier 701 is connected in series with the second analog-to-digital converter 702, so as to convert an analog signal output by the operational amplifier after amplifying an input signal into a digital signal, and the second operational amplifier 701 is the same as the first operational amplifier 501.
The method specifically illustrates that the self-checking phase of starting or running of the electrical equipment is realized by arranging an ohm law algorithm in a shunt device and limiting the branching shunt proportion function, and the self-checking phase automatically detects and evaluates the contact impedance of the shunt, wherein the self-checking phase comprises the following steps:
automatic triggering detection: the equipment starts a contact impedance detection program of the shunt device in a self-checking stage, starts a self-checking function and monitors the working state of the shunt;
an ohm law detection algorithm is performed: the algorithm built in the detection device 4 evaluates the impedance condition of the diverter contact by sending a specific test signal and according to the received feedback signal so as to detect whether the connection is good, whether the contact resistance accords with the expected problem and whether the abnormality exists;
Analysis results: the detection device 4 analyzes and judges the result according to the detected impedance condition of the shunt contact, and when the impedance abnormality is detected, the detection device 4 automatically records fault information or sends warning information to a user;
automatic adjustment and feedback: based on the detection result, the detection device 4 may take measures to automatically adjust, such as providing a suggested solution or automatically calibrating the diverter to ensure proper operation.
Specifically, the impedance detection circuit for the mounting point of the shunt device is used for electronic and electric equipment using the shunt, and the electronic and electric equipment comprises a new battery pack, a fuel cell stack and a quick-charging pile for an electric vehicle.
The specific explanation is that the excitation source circuit 6 is selected to be designed into a board-mounted structure directly printed on a PCB, or is designed into an independent external component, the excitation source circuit 6 is used for providing voltage or current signals, the output voltage or current can be adjusted according to the test requirement so as to measure impedance, the excitation source circuit 6 can also be used for providing stable constant current output, and the output current has high stability, wherein the PCB-mounted constant current has the characteristics of reducing the length of a connecting line and electromagnetic interference, the anti-interference capability and stability can be improved, and the independent external component externally arranged on the PCB has the characteristic of selecting an external mode according to the requirement, so that the circuit design is more flexible and convenient;
The current divider mounting point impedance detection circuit can be used as an independent module and can be integrated with a host, has the characteristics of modularized design, flexibility, universality, expandability, integrated design and function integration, and can adapt to different application scenes and requirements;
The shunt device mounting point impedance detection circuit can be used as a minimum IP unit integration and IC inside, has the characteristics of high integration level, optimized power consumption, stable performance, interference resistance, low cost and IP protection, and is used for reducing the volume of the whole circuit, reducing the line length, improving the reliability and stability of the circuit, reducing the power consumption of the whole system, improving the energy efficiency ratio of the system, reducing the influence of external interference and circuit layout on the circuit performance, improving the stability and interference resistance of the circuit, reducing the manufacturing cost, limiting the imitation and theft of the circuit design and improving the proprietary and uniqueness of the circuit design;
The shunt device mounting point impedance detection circuit can be used as a module in test equipment with shunt off-line equipment, has electrical characteristics and performance parameter test functions, short circuit or open circuit fault diagnosis, automatic test, flexibility and cost effectiveness, is used for detecting the electrical characteristics and performance parameters of the equipment, ensures that the equipment is in a normal working range, is used for measuring electrical parameters such as resistance, current and voltage of the equipment, thereby verifying the normal working state of the equipment, diagnosing equipment faults and rapidly positioning and solving the faults, realizing automatic test, improving test efficiency and accuracy, adapting to the requirements of a large-scale production environment, being more flexibly embedded into the test equipment, customizing and adjusting according to specific test requirements, being suitable for different types of off-line equipment with the shunt, reducing the research and development cost and the production cost of the test equipment, and improving the reliability and the stability of the equipment;
And the active detection shunt contact impedance circuit can be used for a shunt body offline test module and is used for providing reliable electrical characteristic detection functions, helping fault diagnosis and automatic test, being flexibly applied to different scenes, saving cost and improving production efficiency.
Example 2
The invention provides an active detection method for the impedance of a mounting point of a shunt, which is shown in fig. 2, and comprises the following steps:
S1, connecting a preparation load 3 with a main loop: preparing an electronic and electrical device using the shunt device 1, comprising a new energy battery pack, a fuel cell stack and a fast charging pile, preparing a shunt device 1 with four terminals and a direct current source 2, wherein the direct current source 2 supplies power to a load 3 and causes current to flow in a main loop for providing electric energy to the main loop, and the shunt device 1 measures main current by shunting part of the current for measuring the current to the main loop;
S2, setting a diagnosis acquisition circuit 5 and a current acquisition circuit 7: on the one hand, a pair of mounting terminals 102 outside the shunt device 1 are connected in series with a diagnosis acquisition circuit 5, and excitation source circuits 6 are arranged at two ends of the diagnosis acquisition circuit 5, and a constant current output mode exists in the excitation source circuits 6, wherein the excitation source circuits 6 can provide voltage or current signals for testing or measurement, the excitation source circuits 6 can also provide constant current for accurate impedance measurement, and on the other hand, a pair of current acquisition terminals 103 inside the shunt device 1 are connected in series with a current acquisition circuit 7;
S3, measuring impedance: first, the excitation source circuit 6 provides a constant current output known as steady current, which is calibrated as And is transferred to the shunt device 1;
Then the voltage drop across the shunt device 1 is measured using the diagnostic acquisition circuit 5 and calibrated as As a reference measurement value, and the resistance value of the shunt device 1 plus the resistance value of the mounting contact point is calculated through ohm's law and calibrated asThe size of the resistance of the shunt device 1 plus the resistance of the mounting contact is；
Secondly, the known resistance value is marked asThe parameter shunt device 1 calculates the resistance value of the mounting contact through ohm law of a series circuit and marks asThe resistance of the mounting contact is as follows；
Finally, by judging the known resistance parameter of the shunt device 1And mounting contact resistanceThe sum ofThe value of the current divider 1 plus the resistance of the mounting contactComparing to judge whether the mounting contact is abnormal;
s4, monitoring, diagnosing and analyzing: by ohm's law Calculating to obtain the impedance value of each measuring point, wherein,Is the voltage drop measured by the current acquisition circuit,Is the known current provided by the constant current source;
First, the output first current 601 outputted by the excitation source circuit 6 is calibrated as The diagnosis acquisition circuit 5 diagnoses the acquisition voltage and marks asCalculating the resistance value of the shunt device 1 and the resistance value of the mounting contact through ohm's law；
When diagnosing voltageAt volts, the output second current 602, which is output by the excitation source circuit 6, is calibrated asThe diagnosis acquisition circuit 5 diagnoses the acquisition voltage and marks asCalculating the resistance value of the shunt device 1 and the resistance value of the mounting contact through ohm's law；
When diagnosing voltageJudging abnormal mounting points or diagnosing abnormal injection ports when the voltage is high;
When diagnosing voltage AndAll are in normal voltage state, and the resistance value and calibration of the shunt device 1 are as followsCalculating the resistance value of the mounting contact as a known parameter, and calibrating asThenTo determine whether the mounting contact is abnormal;
The output first current 601, which provides a constant current output through the excitation source circuit 6, is designated as The voltage collected by the current collection circuit 7 is calibrated asCalculating the resistance value of the shunt device 1 and calibrating the resistance value asI.e. the magnitude of the resistance of the shunt device 1 isThe resistance value of the shunt device 1 calculated by ohm's lawResistance value of the known shunt device 1Comparing to determine whether the acquisition wire harness is abnormal or whether the current divider body resistance is abnormal, namely when the voltage isJudging that the acquisition linearity is abnormal when the voltage is high;
comparing the impedance values of different measuring points, analyzing the impedance of the mounting position of the shunt device 1, and checking whether the abnormal high resistance or low resistance exists due to poor contact;
S5, optimizing and adjusting: when the impedance abnormality is detected, the installation mode of the shunt device 1 needs to be adjusted, the quality of the contact point is improved, components are replaced, the circuit is calibrated, retested and the installation environment is optimized, the problem of the impedance abnormality of the installation point of the shunt device 1 is effectively solved, the stability and the reliability of the circuit are improved, and accurate current measurement and impedance detection results are ensured.
The invention provides a conventional shunt mounting point contact impedance which needs to be supplemented as shown in fig. 3, and comprises a conventional shunt 8, wherein the conventional shunt 8 is composed of an electrode material 801, a resistance alloy 802 and a bonding material 803, the surface of the shunt is respectively provided with a mounting hole 804 and a sampling point 805, when the conventional shunt 8 is mounted in an electric device and needs to be fixed at the mounting hole 804 by using a screw 807, the conventional shunt 8 is connected with an electric device connecting circuit 806, when the impedance is contacted through the mounting hole 804 and the sampling point 805, the current of the conventional shunt 8 is measured by adopting a four-terminal method, and the current input 808 and the voltage output 809 of the conventional shunt 8 are measured, so that the conventional shunt mounting point contact impedance is easy to cause the problems that the contact impedance is large, the screw fastening force is small and the contact impedance is large due to long-time vibration, the contact point contact impedance is large, and the service life of the current of the shunt is influenced by heating in a large-current operation.
The embodiment of the invention provides an active detection method for the impedance of a shunt installation point, which is realized by the active detection circuit for the impedance of the shunt installation point, and the specific method and the flow of the active detection method for the impedance of the shunt installation point are detailed in the embodiment of the active detection circuit for the impedance of the shunt installation point, and are not repeated herein.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a shunt mounting point impedance active detection circuit, includes shunt device (1), direct current source (2) and load (3), the structure of shunt device (1) includes shunt main part (101), mounting terminal (102) and electric current acquisition terminal (103), just a pair of mounting terminal (102) and direct current source (2) and load (3) in shunt device (1) outside are established ties in proper order and are connected, form the major loop, its characterized in that includes again be provided with detection device (4) on the four terminal of shunt device (1);
The detection device (4) comprises a diagnosis acquisition circuit (5) connected in series with a pair of mounting terminals (102) positioned on the outer side of the shunt device (1), the diagnosis acquisition circuit (5) is connected with the main loop in parallel, the input of the diagnosis acquisition circuit (5) is connected with an excitation source circuit (6), and the excitation source circuit (6) has two modes of excitation output and constant current output;
the detection device (4) further comprises a current collection circuit (7) connected in series with a pair of current collection terminals (103) located inside the shunt device (1).
2. The active detection circuit of shunt mounting point impedance according to claim 1, wherein the direct current source (2) comprises a positive electrode (201) and a negative electrode (202), the positive electrode (201) being one end of a current output, and the negative electrode (202) being an input end of the current.
3. A diverter mounting point impedance active power detection circuit as claimed in claim 2, wherein said excitation source circuit (6) comprises an output first current (601) and an output second current (602), and wherein both excitation and constant current output modes of the excitation source circuit (6) are capable of outputting the first current (601) and outputting the second current (602).
4. A diverter mounting point impedance active detection circuit as claimed IN claim 3, wherein said diagnostic acquisition circuit (5) comprises a first operational amplifier (501) and a first analog-to-digital converter (502), and pin 1 of said first operational amplifier (501) is connected IN series with the first analog-to-digital converter (502), said first operational amplifier (501) comprising pins 1, 2, 3, v+, V-and 1in+, 1 IN-pins;
the No. 1 pin is used for outputting an analog signal obtained by amplifying an input signal by an operational amplifier, and the No. 2 pin and the No. 3 pin are pins connected with the input signal;
the V+ pin and the V-pin respectively represent the positive power supply input and the negative power supply input of the operational amplifier;
1in+ and 1 IN-are the non-inverting input and the inverting input, respectively, of the operational amplifier.
5. The active detection circuit of shunt mounting point impedance according to claim 4, wherein the current collection circuit (7) comprises a second operational amplifier (701) and a second analog-to-digital converter (702), and pin No. 1 of the second operational amplifier (701) is connected in series with the second analog-to-digital converter (702), and the second operational amplifier (701) is identical to the first operational amplifier (501).
6. The active detection circuit of shunt mounting point impedance of claim 5 wherein said shunt device incorporates an ohm's law algorithm and defines a branching shunt ratio function, wherein the self-test phase comprises the steps of:
automatic triggering detection: the equipment starts a contact impedance detection program of the shunt device in a self-checking stage, starts a self-checking function and monitors the working state of the shunt;
An ohm law detection algorithm is performed: an algorithm built in the detection device (4) evaluates the impedance condition of the shunt contact by sending a specific test signal and according to a received feedback signal so as to detect whether the connection is good, whether the contact resistance accords with the expectation or not and whether the problem of abnormality exists or not;
Analysis results: the detection device (4) analyzes and judges the result according to the detected impedance condition of the shunt contact, and when the impedance abnormality is detected, the detection device (4) automatically records fault information or sends warning information to a user;
Automatic adjustment and feedback: based on the detection result, the detection device (4) can take measures to automatically adjust, such as providing a suggested solution or automatically calibrating the shunt to ensure proper operation.
7. The active detection circuit for shunt device mounting point impedance of claim 6, wherein the shunt device mounting point impedance detection circuit is used in an electronic and electrical device using a shunt, and the electronic and electrical device comprises a new battery pack, a fuel cell stack and a fast charging pile for an electric vehicle.
8. A diverter mounting point impedance active test circuit as claimed in claim 7, wherein said excitation source circuit (6) is selectively designed as an on-board structure directly printed on a circuit board PCB or as a separate external component, the excitation source circuit (6) being adapted to provide a voltage, or current signal, and the excitation source circuit (6) being also adapted to provide a stable constant current output;
The shunt device mounting point impedance detection circuit can be used as an independent module and can be integrated with a host machine into a whole;
the shunt device mounting point impedance detection circuit can be used as a minimum IP unit integration and IC internal use;
The shunt device mounting point impedance detection circuit can be used as a module in test equipment with shunt off-line equipment;
and the active detection shunt contact impedance circuit can be used for a shunt body offline test module.
9. A diverter mounting point impedance active detection method implemented by a diverter mounting point impedance active detection circuit as claimed in any one of claims 1 to 8, comprising the steps of:
S1, connecting a preparation load (3) with a main loop: preparing an electronic and electrical device using the shunt device (1), including a new energy battery pack, a fuel cell stack and a quick-fill pile, preparing a shunt device (1) with four terminals and a direct current source (2), wherein the direct current source (2) supplies power to a load (3) and causes current to flow in a main loop, and the shunt device (1) measures main current by shunting part of the current;
S2, a diagnosis acquisition circuit (5) and a current acquisition circuit (7) are arranged: on one hand, a pair of mounting terminals (102) on the outer side of the shunt device (1) are connected with a diagnosis acquisition circuit (5) in series, excitation source circuits (6) are arranged at two ends of the diagnosis acquisition circuit (5), and a constant current output mode exists in the excitation source circuits (6), wherein the excitation source circuits (6) can provide voltage or current signals for testing or measuring, the excitation source circuits (6) can also provide constant current for accurate impedance measurement, and on the other hand, a pair of current acquisition terminals (103) on the inner side of the shunt device (1) are connected with a current acquisition circuit (7) in series;
S3, measuring impedance: first, the excitation source circuit (6) provides a constant current output known as steady current, which is calibrated as And to the shunt device (1);
then the voltage drop across the shunt device (1) is measured by using a diagnosis acquisition circuit (5) and calibrated as As a reference measurement value, and the resistance value of the shunt device (1) plus the resistance value of the mounting contact point is calculated through ohm law and calibrated asThe size of the resistance value of the shunt device (1) plus the resistance value of the mounting contact is；
Secondly, the known resistance value is marked asThe parameter shunt device (1) calculates the resistance value of the installation contact through ohm law of a series circuit and is calibrated asThe resistance of the mounting contact is as follows；
Finally, by judging the known resistance parameter of the shunt device (1)And mounting contact resistanceThe sum ofThe value of the resistor and the resistor value of the shunt device (1) plus the resistor value of the mounting contactComparing to judge whether the mounting contact is abnormal;
s4, monitoring, diagnosing and analyzing: by ohm's law Calculating to obtain the impedance value of each measuring point, wherein,Is the voltage drop measured by the current acquisition circuit,Is the known current provided by the constant current source;
First, the output first current (601) output by the excitation source circuit (6) is calibrated as When the voltage is detected, the detection circuit (5) detects the detection voltage and marks the detection voltage asCalculating the resistance value of the shunt device (1) and the resistance value of the mounting contact through ohm's law；
When diagnosing voltageAt volts, an output second current (602) is output by the excitation source circuit (6), calibrated asWhen the voltage is detected, the detection circuit (5) detects the detection voltage and marks the detection voltage asCalculating the resistance value of the shunt device (1) and the resistance value of the mounting contact through ohm's law；
When diagnosing voltageJudging abnormal mounting points or diagnosing abnormal injection ports when the voltage is high;
When diagnosing voltage AndAre all in normal voltage state, and the resistance value and calibration of the shunt device (1) are as followsCalculating the resistance value of the mounting contact as a known parameter, and calibrating asThenTo determine whether the mounting contact is abnormal;
An output first current (601) is provided by the excitation source circuit (6) and is calibrated as a constant current output The voltage acquired by the current acquisition circuit (7) is calibrated asCalculating the resistance value of the shunt device (1) and calibrating to beI.e. the size of the resistance of the shunt device (1) isResistance value of the shunt device (1) calculated by ohm's lawResistance value of the current divider (1) is equal to that of the known current dividerComparing to determine whether the acquisition wire harness is abnormal or whether the current divider body resistance is abnormal, namely when the voltage isJudging that the acquisition linearity is abnormal when the voltage is high;
Comparing impedance values of different measuring points, analyzing the impedance of the mounting position of the shunt device (1), and checking whether abnormal high resistance or low resistance exists due to poor contact;
S5, optimizing and adjusting: when an impedance anomaly is detected, it is necessary to adjust the mounting manner of the shunt device (1), improve the quality of the contact points, replace components, calibrate and retest the circuit and optimize the mounting environment.
10. The active detection method of the shunt mounting point impedance according to claim 9, wherein the conventional shunt mounting point contact impedance comprises a conventional shunt (8), the conventional shunt (8) is composed of an electrode material (801), a resistance alloy (802) and a bonding material (803), a mounting hole (804) and a sampling point (805) are respectively formed on the surface of the shunt, when the conventional shunt (8) is mounted in an electrical device and needs to be fixed at the position of the mounting hole (804) by using a screw (807), the electrical device is connected with the electrical device connecting circuit (806), and when the impedance is contacted through the mounting hole (804) and the sampling point (805), the magnitude of current flowing through the conventional shunt (8) is measured by adopting a four-terminal connection method, and then the current input (808) and the voltage output (809) of the conventional shunt (8) are measured.
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| CN202410534424.XA CN118112328B (en) | 2024-04-30 | Active detection method for shunt mounting point impedance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101785A (en) * | 2013-04-11 | 2014-10-15 | 中国计量科学研究院 | Four-terminal-method high-value capacitor impedance measuring device and measuring method thereof |
| CN107967374A (en) * | 2017-10-22 | 2018-04-27 | 国网山西省电力公司电力科学研究院 | A kind of sequencing computational methods of current divider impedance parameter |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101785A (en) * | 2013-04-11 | 2014-10-15 | 中国计量科学研究院 | Four-terminal-method high-value capacitor impedance measuring device and measuring method thereof |
| CN107967374A (en) * | 2017-10-22 | 2018-04-27 | 国网山西省电力公司电力科学研究院 | A kind of sequencing computational methods of current divider impedance parameter |
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